"use strict";

exports.__esModule = true;
exports.createBEM = createBEM;

/**
 * bem helper
 * b() // 'button'
 * b('text') // 'button__text'
 * b({ disabled }) // 'button button--disabled'
 * b('text', { disabled }) // 'button__text button__text--disabled'
 * b(['disabled', 'primary']) // 'button button--disabled button--primary'
 */
var ELEMENT = '__';
var MODS = '--';

function join(name, el, symbol) {
    return el ? name + symbol + el : name;
}

function prefix(name, mods) {
    if (typeof mods === 'string') {
        return join(name, mods, MODS);
    }

    if (Array.isArray(mods)) {
        return mods.map(function (item) {
            return prefix(name, item);
        });
    }

    var ret = {};

    if (mods) {
        Object.keys(mods).forEach(function (key) {
            ret[name + MODS + key] = mods[key];
        });
    }

    return ret;
}

function createBEM(name) {
    return function (el, mods) {
        if (el && typeof el !== 'string') {
            mods = el;
            el = '';
        }

        el = join(name, el, ELEMENT);
        return mods ? [el, prefix(el, mods)] : el;
    };
}